@BOOK{ Book!D - 90254085,
AUTHOR = " Tony Gardiner.",
TITLE = "Mathematical challenge /",
LIBRARY= "مرکز و کتابخانه مطالعات اسلامی به زبان‌های اروپایی",
SUBJECT = "Mathematics, Problems, exercises, etc.,Mathematics.",
URL = "/book/90254085/Mathematical-challenge/"}